Inhaler A device that delivers medicine directly into the lungs to relieve breathlessness and control conditions such as Asthma and Chronic Obstructive Pulmonary Disease. DPI (Dry Powder Inhaler) A type of inhaler that contains medicine in powder form and is activated by taking a deep, fast breath. Nebulization Therapy A treatment that converts liquid medicine into a fine mist, which is inhaled through a mask or mouthpiece for easier breathing.